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/********************************************************************************* |
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* Copyright: (C) 2021 LingYun IoT System Studio |
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* All rights reserved. |
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* |
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* Filename: led.c |
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* Description: This file is used to control RGB 3-colors LED |
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* compatible with libgpiod-1.x.x, not compatible with 2.x.x |
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* |
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* |
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* Pin connection: |
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* RGB Led Module Raspberry Pi Board |
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* R <-----> #Pin33(BCM GPIO13) |
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* G <-----> #Pin35(BCM GPIO19) |
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* B <-----> #Pin37(BCM GPIO26) |
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* GND <-----> GND |
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* |
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* System install: |
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* sudo apt install -y libgpiod-dev gpiod |
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* |
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* |
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********************************************************************************/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <dirent.h> |
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#include <string.h> |
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#include <time.h> |
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#include <errno.h> |
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#include <signal.h> |
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#include <gpiod.h> |
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#include "logger.h" |
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#include "leds.h" |
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#define DELAY 500 |
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static led_info_t leds_info[LED_CNT] = |
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{ |
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{"red", 13, 1, NULL }, |
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{"green", 19, 1, NULL }, |
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{"blue", 26, 1, NULL }, |
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}; |
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int init_led(led_ctx_t *ctx, int which) |
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{ |
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int i, rv; |
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led_info_t *led; |
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if( !ctx ) |
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{ |
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log_error("Invalid input arguments\n"); |
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return -1; |
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} |
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ctx->leds = leds_info; |
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ctx->count = LED_CNT; |
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ctx->chip = gpiod_chip_open_by_name("gpiochip0"); |
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if( !ctx->chip ) |
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{ |
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log_error("open gpiochip failure, maybe you need running as root\n"); |
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return -2; |
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} |
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for(i=0; i<ctx->count; i++) |
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{ |
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if( which == i ) |
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{ |
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led = &ctx->leds[i]; |
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led->line = gpiod_chip_get_line(ctx->chip, led->gpio); |
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if( !led->line ) |
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{ |
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log_error("open gpioline for %s[%d] failed\n", led->name, led->gpio); |
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rv = -3; |
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goto failed; |
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} |
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rv = gpiod_line_request_output(led->line, led->name, !led->active); |
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if( rv ) |
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{ |
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log_error("request gpio output for %5s[%d] failed: %s\n", led->name, led->gpio, strerror(errno)); |
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rv = -4; |
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goto failed; |
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} |
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log_debug("request %5s led[%d] for gpio output okay\n", led->name, led->gpio); |
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} |
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} |
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return 0; |
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failed: |
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term_led(ctx, which); |
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return rv; |
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} |
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int term_led(led_ctx_t *ctx, int which) |
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{ |
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int i; |
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led_info_t *led; |
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log_warn("terminate RGB Led gpios\n"); |
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if( !ctx ) |
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{ |
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log_error("Invalid input arguments\n"); |
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return -1; |
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} |
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if( !ctx->chip ) |
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return 0; |
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for(i=0; i<ctx->count; i++) |
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{ |
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if( which == i ) |
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{ |
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led = &ctx->leds[i]; |
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if( led->line ) |
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gpiod_line_release(led->line); |
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} |
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} |
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gpiod_chip_close(ctx->chip); |
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return 0; |
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} |
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int turn_led(int which, int cmd) |
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{ |
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int rv = 0; |
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led_ctx_t ctx; |
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led_info_t *led; |
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if( which<0 || which>=LED_CNT ) |
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{ |
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log_error("Invalid input arguments\n"); |
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return -1; |
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} |
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if( (rv=init_led(&ctx, which)) < 0 ) |
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{ |
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log_error("Initial RGB leds failure, rv=%d\n", rv); |
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return -2; |
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} |
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led = &ctx.leds[which]; |
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if( OFF == cmd ) |
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{ |
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gpiod_line_set_value(led->line, !led->active); |
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} |
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else |
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{ |
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gpiod_line_set_value(led->line, led->active); |
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} |
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term_led(&ctx, which); |
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return 0; |
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} |